diff --git a/authhtpasswd.php b/authhtpasswd.php
index 06f7129..c4587ab 100644
--- a/authhtpasswd.php
+++ b/authhtpasswd.php
@@ -3,6 +3,8 @@
     @package domframework
     @author Dominique Fournier <dominique@fournier38.fr> */
 
+require_once ("domframework/auth.php");
+
 /** User authentication against .htpasswd file
     A .htpasswd can be created by the 'htpasswd' command for Apache, and contain
     toto@toto.com:$2y$05$uHCUNqicE7Pku3MK1qZaDuJxP/pocqCcEAnacZBjsfWgW9EcuG5y2
diff --git a/authldap.php b/authldap.php
index bca51ad..14bea25 100644
--- a/authldap.php
+++ b/authldap.php
@@ -3,6 +3,8 @@
     @package domframework
     @author Dominique Fournier <dominique@fournier38.fr> */
 
+require_once ("domframework/auth.php");
+
 /** User authentication against LDAP server */
 class authldap extends auth
 {
diff --git a/authshibboleth.php b/authshibboleth.php
index fa51781..640a9ed 100644
--- a/authshibboleth.php
+++ b/authshibboleth.php
@@ -3,6 +3,8 @@
     @package domframework
     @author Dominique Fournier <dominique@fournier38.fr> */
 
+require_once ("domframework/auth.php");
+
 /** User authentication against Shibboleth */
 class authshibboleth extends auth
 {
diff --git a/authsql.php b/authsql.php
index 35c8e84..c1a3283 100644
--- a/authsql.php
+++ b/authsql.php
@@ -4,6 +4,7 @@
     @author Dominique Fournier <dominique@fournier38.fr> */
 
 require_once ("domframework/dblayer.php");
+require_once ("domframework/auth.php");
 
 /** User authentication against SQL database */
 class authsql extends auth